Seat support device

Abstract

A base member, a first swinging member, and a second swinging member to which a seat of the vehicle is fixed. One of the base member and the first swinging member includes two first rail portions extending in a first direction, and the other of the base member and the first swinging member rotatably supports a plurality of first rollers, and one of the first swinging member and second swinging member includes two second rail portions extending in a second direction, and the other of the 1 and second swinging members rotatably supports a plurality of second rollers. The first rollers respectively support a lower portion, an upper portion, and a side portion of each of the two first rail portions, and the second rollers respectively support a lower portion, an upper portion, and a side portion of each of the two second rail portions.

What is claimed is: 
     
         1 . A seat support device, comprising:
 a base member;   a first swinging member; and   a second swinging member to which a seat of a vehicle is fixed, wherein   one of the base member and the first swinging member includes two first rail portions that extend in a first direction,   the other one of the base member and the first swinging member rotatably supports a plurality of first rollers that swingably supports the two first rail portions in the first direction,   one of the first swinging member and the second swinging member includes two second rail portions extending in a second direction different to the first direction,   the other one of the first swinging member and the second swinging member rotatably supports a plurality of second rollers that swingably supports the two second rail portions in the second direction,   the first rollers respectively support a lower portion, an upper portion, and a side portion of each of the two first rail portions, and   the second rollers respectively support a lower portion, an upper portion, and a side portion of each of the two second rail portions.   
     
     
         2 . The seat support device according to  claim 1 , further comprising:
 a first motor supported by the base member; and   a second motor supported by the first swinging member, wherein   the first swinging member includes a first gear portion to which power is transmitted from the first motor and that extends along the first direction, and   the second swinging member includes a second gear portion to which power is transmitted from the second motor and that extends along the second direction.   
     
     
         3 . The seat support device according to  claim 2 , wherein:
 the base member and the first swinging member are each frame shaped;   the first motor is encased by the base member;   the second motor is encased by the first swinging member;   first rollers that respectively support the side portions of the two first rail portions are positioned between the two first rail portions or are positioned such that the first rollers sandwich the two first rail portions; and   second rollers that respectively support the side portions of the two second rail portions are positioned between the two second rail portions or are positioned such that the second rollers sandwich the two second rail portions.   
     
     
         4 . The seat support device according to  claim 1 , wherein
 the first rollers include a side portion roller that supports the side portion of the first rail portion,   the first direction is a circular arc direction centered on a prescribed position, and   when the first rail portion and the side portion roller are seen from a direction orthogonal to a surface that includes the first direction, the side portion roller is retracted from a center line that passes through a center of the first rail portion and the prescribed position in the first direction, and an axial center of the side portion roller is inclined with respect to the center line so as to approach the center line with an approach to the prescribed position along the axial center.   
     
     
         5 . The seat support device according to  claim 1 , wherein:
 the base member rotatably supports the first rollers;   the first swinging member includes the two first rail portions and rotatably supports the second rollers; and   the second swinging member includes the two second rail portions.